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Product description

A simple, easy to use 1-week programmable thermostat. You set it up to adjust the temperature when you are away or asleep-times when you don't necessarily need to heat or cool your home to optimum comfort-and your HVAC equipment runs less. Plus, your heating or cooling comes back to the comfort level you desire before you come home or wake up. Honeywell programmable thermostats are easy to install and are pre-programmed for your convenience. For more than a century, Honeywell thermostats have been the popular choice of homeowners. This thermostat is compatible with single-stage heating/cooling systems, heating, cooling, heat pumps without backup heat, mill volt, pellet stoves and fireplaces. It does NOT work with electric baseboard heat (120-240 V), heat pump systems with backup heat or multi-stage heating/cooling.

Top customer reviews

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I wanted a simple to install thermostat to replace the aging, mercury switched Honeywell items that control our heat and cooling. After researching I decided that a simple weekly timer is good enough, and certainly better that what we had originally. The RTH221B shows the current temperature and can be set to adjust the temperature when you wake, leave, return and night. It is simple to use with 15 minute increments.

Installation says "15 minutes or under" and I found this to be true.

To install:

Turn off power to furnace and thermostat (although it is a low voltage feed, you MUST still do this) Unscrew the original thermostat from the wall but leave wires attached Check the color of the wires and which terminals they attach to on the original (look for small letters W,R,Y,Rc etc) Mark the wires (if needed) with the stickers provided in the package Unhook wires from the original Remove backing plate from new thermostat, thread wires through hole and place against wall Attach backing plate using screws and wall plugs provided Put 2 x AAA batteries(NOT supplied)in the faceplate Attach previously marked wired to the matching terminals at the back of the faceplate Snap faceplate onto backing plate Read instructions for setting time and programs Turn power to furnace back on

Pros: cheap, easy to install, good instructionsCons: would have been nice to include 2 x AAA batteries

I have put in quite a few of these easy to use programmable thermostats. They work great despite the fact that they are super inexpensive. For a renter, like me, the ability to set my thermostat saves me big time on my utility bill. And at this price-I don’t feel bad about just leaving it in when I move. Yes-you can thank me if you are the renter after me!Unfortunately, this one is as sort of a dud. The tiny screw in which you I sent your “hot” wire under would not budge and appeared to be stripped or defective. I wasn’t able to get the wire under it and inserted. Luckily I have an electrician friend who helped me get it in there. I would have just sent it back but the temp is dropping and I am stubborn about that kind of thing.All-in-all, great little thermostat. Woukd hsve tated a 5 bit i just happened to get one that was less than the awesome products I usually get from Honeywell.By the way-check with your utilities company. My offered a rebate since I was putting in a programmable unit.

They say "you get what you pay for"! I paid cheap ... I got cheap. This is an absolute piece of garbage. I followed the instructions to separate the mounting plate from the body. The whole thermostat fell apart! Buttons fell off, the zebra strip (which connects the circuit board to the LCD) came off. Very poor design. (I happen to be an EE, so I know a bit about these things.) No way to put it back together. It went straight into the garbage. I'll go to HD to get one that is better designed.

It works well, but I will only give it 4 stars because the instructions to connect the cables do not work for all systems and are not precise. I am lucky that I had a friend in teh business who could come and straighten it out for me without ripping me off

This thermostat gets me hot, but never cools me down. I suppose If I had central air, then things might be different. If you are like me, and you are replacing an old old vertical thermostat with this horizontal one, be warned, it won't cover the same spot as the old one. Chances are, the wall behind the old one was never painted, or is a different color than your current paint. SO, this cheap little thermostat is a great deal if you don't include the cost of repainting the walls. I am sure many other more expensive thermostats may have the same issue, so get out your rulers.